Abstract
We investigate time-dependent properties of Einstein-Podolsky-Rosen (EPR) light beams generated in nondegenerate optical parametric oscillator (NOPO) driven by a sequence of laser pulses with Gaussian time-dependent envelops. The peculiarities of EPR beams are discussed on the base of quadrature squeezing and also in the framework of phase-space Wigner functions for EPR beams which are combined on a half beam splitter. We also investigate the Wigner functions of intensity-correlated twin beams following the conditional photon state-preparation scheme. It is demonstrated that the Wigner functions involve negative values in parts of the phase space for the schemes with one-, two-, and three-photons.
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